I am getting the following error in many of my pages in IE9.
Error: Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method.
It is coming from the scriptresource.axd. I have tried everything to nail this down. It seems to be related to having an UpdatePanel and ModalPopupExtender. After I interact with a "popup form" containing both of those and click on another link on the page
I get the script error that causes IE to hang forever. Everything works perfectly in Firefox, Chrome and Safari. Please help!!
Disabling the Update Panels through setting EnablePartialRendering="false" in the <ajaxToolkit:ToolkitScriptManager> tag gets rid of this error of course it also gets rid of the functionality of the UpdatePanels for the ModalPopups which makes the entire screen have to reload to show them, etc.
I really need a fix for this ASAP. I have been searching for 2 days and tried every workaround I can find thus far and nothing short of setting EnablePartialRenderting to false works.
Please Help!!